Windmill blade and processes related thereto

Details Windmill blade and processes related thereto Windmill blade and processes related thereto

1975-01-15

1977-01-18

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Sectional, staged or nonrigid working member

416 41, 416 48, 416158, F03D 700

Patent

active

040036766

ABSTRACT:
A windmill blade that has a rigid leading edge, a rigid root portion and a movable blade tip. Control of the geometric twist of the windmill blade is accomplished through proper selection of the axis of rotation for the movable blade tip and by controlling the position of the windmill blade tip with a servo motor or by controlling the position of the windmill blade tip with a spring and a weight. The ability to vary the geometric twist of the blade enables the frequency of rotation of the blade to be controlled to reduce wind drags upon the blade. This improved windmill blade eliminates the need for current complicated and expensive rotor hubs which are used to vary the blade pitch angle at the root end of the blade to reduce wind drag upon the blade. Processes related to the windmill blade are also presented.

REFERENCES:
patent: 1417000 (1922-05-01), Vogt et al.
patent: 1953444 (1934-04-01), Stalker
patent: 2622686 (1952-12-01), Chevreau et al.
patent: 2633921 (1953-04-01), Monney
patent: 3227221 (1966-01-01), You
patent: 3806277 (1974-04-01), Hill
patent: 3874816 (1975-04-01), Sweeney et al.

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